We’re in the midst of the Earth’s sixth mass extinction crisis. Harvard biologist E. O. Wilson estimates that 30,000 species per year (or three species per hour) are being driven to extinction. Compare this to the natural background rate of one extinction per million species per year, and you can see why scientists refer to it as a crisis unparalleled in human history.
The current mass extinction differs from all others in being driven by a single species rather than a planetary or galactic physical process.
Sixth mass extinction: The era of ‘biological annihilation’ (CNN video)
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